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Full text of "Treatise On Applied Analytical Chemistry(Vol-1)"

206

FERRO-MOLYBDENUM

TABLE XVIII
Compositions of Ferro-vanadium

No.
	V      :     Fe
	C
	Si
	Al
	Mn
	Cu
	s
	p

I
	55-0      40-00
	4-00
	0-30
	o-io
	0-30
	—
	0-03
	0-04

2
	52-8   : 45-84
	1-04
	0-09
	—
	—
	—
	0-025
	O-O2

3
	47'4   : 51-20
	1-07
	O-Op
	—
	0-07
	o-oi
	0-009
	—

4
	34-1      64-22
	1-42
	O-I2
	O-I2
	O-I2
	
	0-03
	0-009

FERRO -MOLYBDENUM

This is obtained industrially by electro-thermal processes and is used
essentially, together with chromo-molybdenum and molybdenum, for
making molybdenum steels. The elements commonly estimated are
molybdenum, carbon, silicon, manganese, phosphorus, sulphur and tungsten.

1.  Determination of the Molybdenum.—1-2 grams of the finely
powdered sample are heated at not too high a temperature with about 10
parts of the sodium carbonate and magnesia mixture, the semi-fused mass
being extracted with hot water;   these operations are then repeated to
extract any small quantities of molybdenum remaining in the residue (see
Chrome Steels).   The two solutions together are made up to 500 c.c. in a
measuring flask and the molybdenum in an aliquot part (50—100 c.c.)
determined as in molybdenum steels.

2.  Determination of the Carbon.—By direct combustion in a current
of oxygen (see Iron, i, 6).

3.  Determination of the Silicon,  Manganese, Phosphorus and
Sulphur.—As in ferro-silicon.

4.  Determination of the Tungsten.—In an aliquot part of the 500
c.c. of solution (see i, above) the tungsten is determined as in ferro-tungsten.

*
* *

According to the character of the original ores, different types of ferro-
molybdenum are obtained. These may contain 15-80% of molybdenum
(usually 5°-7°%). fr°m 0-5% (for the more refined products) to 5% of carbon,
0-1-0-5% of silicon and small quantities of manganese, sulphur, phosphorus,
and sometimes tungsten.

The commoner commercial products have the following mean compositions
(Gufflet) :

TABLE XIX
Compositions of Ferro-molybdenum

Type.
	Mo
	C
	Fe
	Si
	Al
	S
	p

Ordinary ferro -molybdenum Refined                  „ Rich
	53-30 52-00 84-80
	I-87
 o-34 2-27
	—
	0-17 0-09 o-ii
	Trace
	0-03 o-oi
 O-O2
	0-03
 0-009 0-007


water.ganese, phosphorus, etc. ; that from the blast